Year	Percent
1990	57.976
1991	59.616
1992	61.698
1993	63.083
1994	65.039
1995	65.679
1996	67.436
1997	69.555
1998	70.714
1999	72.298
2000	73.014
2001	74.241
2002	75.512
2003	76.495
2004	77.955
2005	78.975
2006	80.044
2007	81.206
2008	82.539
2009	83.056
2010	82.364
2011	81.79
2012	82.296
2013	82.597
2014	81.954
2015	82.136
2016	82.156
2017	82.485
2018	82.815
2019	83.149
2020	83.484
2021	83.823
2022	84.162
2023	84.502
2024	84.843
2025	85.185
2026	85.526
2027	85.865
2028	86.201
2029	86.533
2030	86.862