Year	Percent
1990	70.871
1991	70.502
1992	70.179
1993	69.868
1994	69.59
1995	70.585
1996	71.699
1997	72.141
1998	70.902
1999	69.968
2000	70.586
2001	70.491
2002	70.546
2003	70.637
2004	70.68
2005	71.19
2006	70.301
2007	70.968
2008	71.129
2009	70.727
2010	70.582
2011	72.411
2012	71.717
2013	69.62
2014	69.259
2015	67.977
2016	67.889
2017	67.951
2018	68.037
2019	68.132
2020	68.228
2021	68.325
2022	68.424
2023	68.523
2024	68.618
2025	68.709
2026	68.792
2027	68.867
2028	68.944
2029	69.04
2030	69.162