Year	Percent
1990	47.579
1991	48.016
1992	48.984
1993	50.015
1994	51.134
1995	52.349
1996	53.268
1997	54.298
1998	55.446
1999	56.64
2000	57.789
2001	58.302
2002	58.305
2003	58.419
2004	58.673
2005	59.031
2006	59.31
2007	59.588
2008	59.91
2009	60.288
2010	60.712
2011	61.206
2012	61.687
2013	62.17
2014	62.666
2015	62.425
2016	62.121
2017	62.287
2018	62.457
2019	62.645
2020	62.862
2021	63.105
2022	63.38
2023	63.662
2024	63.907
2025	64.089
2026	64.209
2027	64.271
2028	64.297
2029	64.328
2030	64.386