Year	Percent
1990	54.497
1991	55.278
1992	56.011
1993	56.545
1994	56.959
1995	57.661
1996	58.295
1997	59.196
1998	59.793
1999	60.101
2000	60.951
2001	61.795
2002	62.029
2003	62.339
2004	63.9
2005	65.082
2006	66.171
2007	65.799
2008	66.606
2009	67.392
2010	67.605
2011	68.054
2012	68.146
2013	68.744
2014	69.105
2015	69.364
2016	68.99
2017	69.306
2018	69.633
2019	69.964
2020	70.294
2021	70.625
2022	70.957
2023	71.285
2024	71.605
2025	71.915
2026	72.218
2027	72.512
2028	72.8
2029	73.086
2030	73.375