Year	Percent
1990	62.062
1991	62.168
1992	62.205
1993	62.192
1994	62.184
1995	62.216
1996	62.336
1997	63.234
1998	64.363
1999	63.082
2000	63.108
2001	62.61
2002	63.82
2003	62.504
2004	65.858
2005	65.931
2006	66.701
2007	66.854
2008	67.768
2009	67.669
2010	67.583
2011	66.805
2012	67.256
2013	66.826
2014	67.331
2015	67.912
2016	68.619
2017	68.704
2018	68.815
2019	68.888
2020	68.883
2021	68.806
2022	68.657
2023	68.46
2024	68.257
2025	68.077
2026	67.909
2027	67.754
2028	67.618
2029	67.508
2030	67.43