Comparison of visitor numbers to Cardiff and Dublin from 2011 to 2020.

Problem Description:

The image provided is a line graph showing the number of visitors to two cities, Cardiff and Dublin, over a period from 2011 to 2020. The task is to analyze the trends in visitor numbers for both cities and draw conclusions based on the data.

Solution:

#### Step 1: Understand the Graph
- X-axis: Represents the years from 2011 to 2020.
- Y-axis: Represents the number of visitors in millions.
- Lines:
- The blue line represents the number of visitors to Cardiff.
- The red line represents the number of visitors to Dublin.

#### Step 2: Analyze the Trends for Each City

##### Visitors to Cardiff (Blue Line):
1. Initial Trend (2011–2014):
- In 2011, the number of visitors to Cardiff was around 1.5 million.
- From 2011 to 2014, there is a gradual increase in the number of visitors, reaching approximately 2.2 million by 2014.

2. Decline (2014–2018):
- From 2014 to 2016, there is a slight dip, with the number of visitors dropping to around 2 million.
- In 2017, the number of visitors further declines to about 1.8 million.
- By 2018, the number of visitors reaches its lowest point during this period, around 1.6 million.

3. Sharp Increase (2018–2020):
- Starting in 2019, there is a significant upward trend.
- By 2019, the number of visitors increases to around 3.8 million.
- In 2020, the number of visitors peaks at approximately 5.2 million.

##### Visitors to Dublin (Red Line):
1. Initial Trend (2011–2014):
- In 2011, the number of visitors to Dublin was around 3.8 million.
- From 2011 to 2014, there is a steady decline, with the number of visitors dropping to approximately 3.2 million by 2014.

2. Fluctuations (2014–2018):
- From 2014 to 2015, there is a slight increase, reaching around 3.5 million.
- In 2016, the number of visitors drops again to around 2.8 million.
- From 2016 to 2017, there is another small increase, reaching approximately 3 million.
- By 2018, the number of visitors decreases to around 2.5 million.

3. Stable Decline (2018–2020):
- From 2018 to 2020, the number of visitors to Dublin continues to decline steadily.
- By 2020, the number of visitors reaches approximately 2 million.

#### Step 3: Compare the Two Cities
1. Initial Comparison (2011):
- Dublin had significantly more visitors than Cardiff in 2011 (3.8 million vs. 1.5 million).

2. Trend Reversal:
- Over the years, the number of visitors to Cardiff shows a general upward trend, especially after 2018.
- Conversely, the number of visitors to Dublin shows a general downward trend, especially after 2014.

3. Final Comparison (2020):
- By 2020, Cardiff surpasses Dublin in terms of visitor numbers (5.2 million vs. 2 million).

#### Step 4: Draw Conclusions
- Cardiff:
- Experienced a significant growth in visitor numbers, particularly after 2018.
- The sharp increase in 2019 and 2020 suggests that Cardiff may have become a more attractive destination over time.

- Dublin:
- Showed a consistent decline in visitor numbers over the entire period.
- The steady decrease indicates potential challenges or changes in factors affecting tourism in Dublin.

- Overall:
- The trend reversal between 2011 and 2020 highlights a shift in popularity, with Cardiff becoming a more popular destination compared to Dublin.

Final Answer:

\[
\boxed{\text{Cardiff experienced significant growth in visitor numbers, surpassing Dublin by 2020, while Dublin showed a consistent decline.}}
\]