Year	Percent
1990	58.02
1991	60.569
1992	58.673
1993	59.218
1994	59.701
1995	59.515
1996	60.282
1997	61.46
1998	62.229
1999	62.878
2000	63.622
2001	64.557
2002	65.302
2003	66.425
2004	66.437
2005	67.704
2006	68.272
2007	68.809
2008	68.955
2009	68.916
2010	69.641
2011	69.42
2012	69.662
2013	69.714
2014	69.945
2015	70.372
2016	70.616
2017	70.676
2018	70.735
2019	70.789
2020	70.835
2021	70.871
2022	70.904
2023	70.946
2024	71.012
2025	71.112
2026	71.238
2027	71.403
2028	71.594
2029	71.784
2030	71.956