Year	Percent
1990	66.463
1991	67.69
1992	67.966
1993	67.582
1994	67.281
1995	66.874
1996	66.653
1997	66.987
1998	66.752
1999	66.45
2000	66.311
2001	66.159
2002	66.085
2003	66.465
2004	66.858
2005	67.252
2006	67.593
2007	67.922
2008	68.245
2009	66.148
2010	68.469
2011	68.982
2012	69.46
2013	65.733
2014	66.9
2015	71.61
2016	71.685
2017	71.776
2018	71.862
2019	71.933
2020	71.982
2021	72.008
2022	72.011
2023	72.004
2024	72.007
2025	72.035
2026	72.088
2027	72.172
2028	72.286
2029	72.417
2030	72.556