Year	Percent
1991	68.069
1992	68.679
1993	67.222
1994	64.641
1995	64.167
1996	63.476
1997	65.67
1998	65.638
1999	66.761
2000	66.834
2001	67.506
2002	64.612
2003	66.162
2004	69.296
2005	63.742
2006	67.394
2007	68.487
2008	68.585
2009	68.277
2010	68.618
2011	70.035
2012	68.147
2013	71.187
2014	68.304
2015	71.44
2016	71.616
2017	71.627
2018	71.714
2019	72.217
2020	72.583
2021	73.119
2022	73.625