Year	Percent
1990	70.492
1991	70.505
1992	69.809
1993	69.759
1994	69.97
1995	69.947
1996	69.987
1997	71.122
1998	71.775
1999	71.773
2000	72.785
2001	73.055
2002	73.598
2003	72.837
2004	72.717
2005	72.331
2006	72.454
2007	72.913
2008	73.28
2009	73.176
2010	71.32
2011	70.334
2012	70.725
2013	70.623
2014	70.375
2015	70.083
2016	69.543
2017	69.193
2018	68.867
2019	68.546
2020	68.218
2021	67.897
2022	67.58
2023	67.261
2024	66.937
2025	66.604
2026	66.278
2027	65.951
2028	65.625
2029	65.303
2030	64.986