Year	Percent
1990	52.198
1991	52.479
1992	52.755
1993	53.008
1994	53.209
1995	53.335
1996	53.345
1997	53.292
1998	53.202
1999	53.114
2000	53.051
2001	53.032
2002	53.038
2003	53.063
2004	53.093
2005	53.122
2006	53.148
2007	53.173
2008	53.152
2009	53.389
2010	54.847
2011	57.818
2012	57.793
2013	58.66
2014	57.975
2015	57.18
2016	57.336
2017	57.736
2018	58.104
2019	58.46
2020	58.813
2021	59.164
2022	59.502
2023	59.831
2024	60.157
2025	60.484
2026	60.819
2027	61.156
2028	61.491
2029	61.82
2030	62.143