How did I find the total percent change for 2019-2021 for my profit loss statement?

	2019	2020	2021	Change	Change %
Income
Salaries	$ 397,687.00	$ 399,537.00	$ 389,890.00	$ (391,740.00)
Wages	$ 756,358.00	$ 754,509.00	$ 764,156.00	$ (762,307.00)
Fringes	$ 384,237.00	$ 411,280.00	$ 411,994.00	$ 439,037.00
Travel	$ 37,100.00	$ 37,000.00	$ 37,100.00	$ (37,000.00)
Contractual	$ 2,289,770.00	$ 2,039,770.00	$ 1,878,517.00	$ (1,628,517.00)
Commodities	$ 311,500.00	$ 261,500.00	$ 186,500.00	$ (136,500.00)
Equipment	$ 22,500.00	$ 272,500.00	$ 172,500.00	$ (422,500.00)
Work Orders	$ 83,000.00	$ 161,000.00	$ 141,000.00	$ (219,000.00)
Transfers	$ 1,861,582.00	$ 2,033,582.00	$ 2,053,582.00	$ (2,225,582.00)
Adminstration	$ 302,490.00	$ 301,197.00	$ 399,117.00	$ (397,824.00)
Parking Enforcement	$ 31,000.00	$ 256,000.00	$ 240,150.00	$ (234,750.00)
Transportation	$ 1,974,025.00	$ 1,566,000.00	$ 14,033.00	$ 393,992.00
Bike Shop	$ 13,000.00	$ 7,250.00	$ 9,500.00	$ (3,750.00)
Garage	$ 2,074,517.00	$ 2,125,519.00	$ 2,222,322.00	$ (2,273,324.00)
Meter	$ 50,320.00	$ 24,405.00	$ 62,000.00	$ (36,085.00)
Total Income	$ 10,589,086.00	$ 10,651,049.00	$ 8,982,361.00	$ (7,935,850.00)
Gross Income	$ 10,589,086.00	$ 10,651,049.00	$ 8,982,361.00	$ (7,935,850.00)