Year	Percent
1990	57.062
1991	57.902
1992	58.278
1993	58.24
1994	58.364
1995	58.466
1996	58.911
1997	59.696
1998	59.782
1999	59.492
2000	59.528
2001	59.96
2002	59.694
2003	59.98
2004	60.137
2005	60.709
2006	61.083
2007	61.67
2008	62.082
2009	62.838
2010	63.177
2011	63.189
2012	63.64
2013	65.139
2014	66.084
2015	66.848
2016	68.132
2017	68.417
2018	68.699
2019	68.966
2020	69.206
2021	69.417
2022	69.6
2023	69.762
2024	69.912
2025	70.057
2026	70.191
2027	70.319
2028	70.44
2029	70.553
2030	70.656