Year	Percent
1990	72.548
1991	72.396
1992	71.237
1993	70.316
1994	70.097
1995	69.418
1996	68.916
1997	68.787
1998	68.496
1999	68.293
2000	67.739
2001	67.191
2002	66.66
2003	66.37
2004	65.888
2005	66.713
2006	66.667
2007	66.803
2008	66.71
2009	66.572
2010	66.461
2011	66.729
2012	66.597
2013	66.634
2014	66.524
2015	66.216
2016	66.274
2017	66.168
2018	66.053
2019	65.921
2020	65.766
2021	65.519
2022	65.251
2023	64.959
2024	64.637
2025	64.283
2026	63.862
2027	63.421
2028	62.971
2029	62.533
2030	62.118