Year	Percent
1990	29.95
1991	30.087
1992	30.719
1993	31.429
1994	32.198
1995	32.98
1996	33.562
1997	34.131
1998	34.745
1999	35.445
2000	36.231
2001	36.936
2002	37.648
2003	38.496
2004	39.436
2005	40.418
2006	41.111
2007	41.96
2008	42.96
2009	44.072
2010	45.242
2011	44.466
2012	44.679
2013	44.897
2014	45.127
2015	45.337
2016	45.449
2017	45.602
2018	45.81
2019	46.062
2020	46.346
2021	46.172
2022	46.101
2023	46.146
2024	46.306
2025	46.551
2026	46.678
2027	46.886
2028	47.16
2029	47.496
2030	47.879