Year	Percent
1990	49.384
1991	51.309
1992	54.777
1993	54.198
1994	55.717
1995	52.639
1996	55.832
1997	57.851
1998	58.199
1999	61.663
2000	64.834
2001	64.885
2002	66.526
2003	66.398
2004	70.409
2005	72.185
2006	74.144
2007	74.753
2008	72.901
2009	75.241
2010	76.421
2011	77.164
2012	79.148
2013	80.467
2014	80.918
2015	81.3
2016	81.026
2017	81.355
2018	81.691
2019	82.039
2020	82.402
2021	82.768
2022	83.146
2023	83.53
2024	83.917
2025	84.303
2026	84.674
2027	85.046
2028	85.414
2029	85.773
2030	86.12