Year	Percent
1990	34.489
1991	35.054
1992	35.686
1993	35.884
1994	35.635
1995	35.783
1996	36.131
1997	37.128
1998	38.142
1999	39.193
2000	40.278
2001	41.369
2002	42.492
2003	43.63
2004	44.766
2005	45.882
2006	47.181
2007	48.489
2008	49.803
2009	51.125
2010	52.444
2011	53.498
2012	54.527
2013	53.701
2014	52.93
2015	52.212
2016	52.768
2017	53.239
2018	53.719
2019	54.207
2020	54.708
2021	55.189
2022	55.678
2023	56.16
2024	56.614
2025	57.024
2026	57.383
2027	57.705
2028	58.004
2029	58.288
2030	58.562