In the first week of​ July,1,020 a record people went to the local swimming pool. In the second​ week, 125 fewer people went to the pool than in the first week. In the third​ week, 145 more people went to the pool than in the second week. In the fourth​ week, 175 fewer people went to the pool than in the third week. What is the percent decrease in the number of people who went to the pool over these four​ weeks?