Each dot in the scatterplot above represents the temperature and the number of people who visited a beach in Lagos, Nigeria, on one of eleven different days. The x-axis represents the average temperature, and the y-axis represents the number of people. The line of best fit for the data is also shown. According to the line of best fit, what is the approximate increase in the number of people predicted to visit the beach for every $1^{\circ }\text{C}$ increase in average temperature?