Year	Percent
1990	52.483
1991	53.019
1992	53.753
1993	54.488
1994	55.2
1995	55.86
1996	56.444
1997	56.976
1998	57.47
1999	57.956
2000	58.458
2001	59.003
2002	59.774
2003	60.939
2004	62.334
2005	63.111
2006	64.316
2007	64.821
2008	65.428
2009	65.63
2010	65.683
2011	66.15
2012	66.531
2013	67.002
2014	67.478
2015	68.025
2016	68.425
2017	68.821
2018	69.212
2019	69.59
2020	69.963
2021	70.4
2022	70.83
2023	71.231
2024	71.584
2025	71.885
2026	72.209
2027	72.477
2028	72.691
2029	72.874
2030	73.049