Year	Percent
1990	65.477
1991	66.044
1992	66.484
1993	67.068
1994	67.682
1995	68.298
1996	68.833
1997	69.409
1998	70.094
1999	70.763
2000	71.405
2001	72.009
2002	72.595
2003	73.17
2004	73.736
2005	74.285
2006	74.81
2007	72.239
2008	74.516
2009	74.472
2010	74.048
2011	73.593
2012	72.036
2013	71.319
2014	72.196
2015	66.374
2016	66.911
2017	67.038
2018	67.166
2019	67.295
2020	67.424
2021	67.551
2022	67.679
2023	67.807
2024	67.938
2025	68.072
2026	68.208
2027	68.348
2028	68.493
2029	68.64
2030	68.79