Average Daily Visitors to a City Park

The line graph below illustrates the average daily visitors to a city park over six months, from January to June. The vertical axis represents the number of visitors (in thousands), while the horizontal axis indicates the months. During this period, the average daily visitors showed a fluctuating trend.

In January, the park had an average of 5,000 visitors, which rose incrementally to 8,000 visitors in February. The number of visitors peaked at 12,000 in April, followed by a slight decrease to 10,000 in May, and further decreased to 6,000 in June. Analyze the graph to answer the following question.