Year	Percent
1990	52.351
1991	53.777
1992	52.758
1993	52.222
1994	53.33
1995	53.68
1996	54.275
1997	54.787
1998	56.068
1999	57.119
2000	57.81
2001	59.315
2002	60.537
2003	61.436
2004	63.701
2005	63.632
2006	64.292
2007	64.065
2008	65.218
2009	64.488
2010	64.435
2011	64.626
2012	66.426
2013	66.065
2014	66.325
2015	65.86
2016	66.755
2017	66.946
2018	67.139
2019	67.333
2020	67.53
2021	67.73
2022	67.933
2023	68.138
2024	68.345
2025	68.551
2026	68.755
2027	68.957
2028	69.154
2029	69.348
2030	69.538