The graph shows how milk production from a herd of cows has changed.
a
8
7
mean gallons of
per cow
milk
6
5
4
2005
9007
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
year
Explain how a farmer could have produced these results from his cows.