Year	Percent
1990	72.427
1991	72.862
1992	73.215
1993	73.609
1994	73.549
1995	73.566
1996	73.786
1997	73.769
1998	73.647
1999	73.372
2000	72.934
2001	72.354
2002	71.716
2003	70.912
2004	70.235
2005	69.731
2006	69.426
2007	69.186
2008	69.101
2009	68.896
2010	68.582
2011	68.359
2012	68.1
2013	68.002
2014	67.832
2015	67.592
2016	67.439
2017	67.239
2018	67.05
2019	66.864
2020	66.68
2021	66.526
2022	66.369
2023	66.198
2024	65.998
2025	65.767
2026	65.544
2027	65.3
2028	65.055
2029	64.847
2030	64.692