Year	Percent
1990	71.814
1991	71.985
1992	71.909
1993	69.39
1994	67.7
1995	68.129
1996	66.565
1997	65.981
1998	65.924
1999	66.978
2000	67.224
2001	67.163
2002	66.82
2003	67.542
2004	67.03
2005	67.755
2006	68.477
2007	68.421
2008	67.856
2009	67.656
2010	67.668
2011	68.272
2012	69.318
2013	70.616
2014	73.062
2015	75.012
2016	76.785
2017	76.909
2018	77.048
2019	77.174
2020	77.266
2021	77.309
2022	77.313
2023	77.279
2024	77.215
2025	77.125
2026	76.994
2027	76.842
2028	76.67
2029	76.48
2030	76.271