Year	Percent
1990	52.568
1991	53.404
1992	55.039
1993	56.404
1994	58.269
1995	59.308
1996	59.302
1997	59.249
1998	59.359
1999	60.913
2000	62.165
2001	62.287
2002	61.834
2003	62.903
2004	63.406
2005	63.972
2006	64.552
2007	65.169
2008	65.184
2009	66.112
2010	66.393
2011	66.123
2012	67.189
2013	67.391
2014	68.508
2015	68.43
2016	68.858
2017	69.04
2018	69.229
2019	69.409
2020	69.572
2021	69.71
2022	69.838
2023	69.957
2024	70.067
2025	70.168
2026	70.25
2027	70.324
2028	70.404
2029	70.512
2030	70.662