Year	Percent
1990	41.641
1991	42.2
1992	43.037
1993	45.177
1994	46.839
1995	45.361
1996	43.919
1997	44.152
1998	47.846
1999	48.284
2000	48.063
2001	47.838
2002	47.616
2003	49.305
2004	47.535
2005	48.352
2006	49.181
2007	49.555
2008	49.688
2009	49.813
2010	49.698
2011	50.149
2012	50.61
2013	51.926
2014	51.379
2015	50.865
2016	50.402
2017	50.828
2018	51.283
2019	51.74
2020	52.181
2021	52.621
2022	53.048
2023	53.463
2024	53.867
2025	54.262
2026	54.653
2027	55.033
2028	55.401
2029	55.755
2030	56.095