Year	Percent
1990	54.714
1991	55.051
1992	55.269
1993	55.709
1994	56.177
1995	56.315
1996	56.445
1997	56.56
1998	56.67
1999	56.787
2000	56.915
2001	57.067
2002	57.227
2003	57.394
2004	57.563
2005	57.736
2006	57.916
2007	58.11
2008	57.879
2009	59.017
2010	56.673
2011	58.502
2012	63.189
2013	61.898
2014	59.212
2015	59.305
2016	59.918
2017	60.303
2018	60.703
2019	61.097
2020	61.474
2021	61.844
2022	62.193
2023	62.529
2024	62.861
2025	63.197
2026	63.544
2027	63.893
2028	64.239
2029	64.578
2030	64.907