Year	Percent
1990	67.562
1991	67.234
1992	67.071
1993	66.939
1994	66.883
1995	66.815
1996	66.529
1997	66.156
1998	65.86
1999	65.701
2000	65.846
2001	65.99
2002	66.213
2003	66.503
2004	66.855
2005	67.291
2006	67.614
2007	68.037
2008	68.523
2009	69.048
2010	69.536
2011	69.89
2012	70.231
2013	70.54
2014	70.792
2015	70.981
2016	70.935
2017	70.667
2018	70.337
2019	69.965
2020	69.567
2021	68.992
2022	68.401
2023	67.822
2024	67.289
2025	66.826
2026	66.299
2027	65.851
2028	65.488
2029	65.215
2030	65.035