2016 net income margin: 21.5%
2015 net income margin: 21.7%
2014 net income margin: 21.3%
2013 net income margin: 20.4%
2012 net income margin: 21.6%
2016 net income margin: 21.5%
2015 net income margin: 21.7%
2014 net income margin: 21.3%
2013 net income margin: 20.4%
2012 net income margin: 21.6%