Year	Percent
1990	75.593
1991	75.446
1992	74.769
1993	74.76
1994	74.579
1995	74.262
1996	73.868
1997	73.528
1998	72.886
1999	72.246
2000	71.608
2001	71
2002	70.385
2003	69.771
2004	69.171
2005	68.588
2006	68.768
2007	68.947
2008	69.228
2009	68.97
2010	69.671
2011	70.293
2012	70.924
2013	70.875
2014	70.772
2015	70.806
2016	70.79
2017	70.589
2018	70.347
2019	70.061
2020	69.728
2021	69.337
2022	68.912
2023	68.448
2024	67.94
2025	67.388
2026	66.8
2027	66.179
2028	65.552
2029	64.954
2030	64.405