Year	Percent
1990	67.642
1991	67.411
1992	68.731
1993	68.992
1994	69.377
1995	71.282
1996	69.555
1997	68.559
1998	70.129
1999	72.209
2000	73.737
2001	72.617
2002	71.968
2003	71.795
2004	71.44
2005	70.876
2006	71.506
2007	71.54
2008	70.912
2009	70.264
2010	70.634
2011	70.215
2012	70.839
2013	71.481
2014	72.147
2015	73.098
2016	73.172
2017	72.833
2018	72.482
2019	72.113
2020	71.718
2021	71.33
2022	70.93
2023	70.521
2024	70.113
2025	69.708
2026	69.342
2027	68.988
2028	68.649
2029	68.315
2030	67.985