Year	Percent
1990	55.233
1991	56.011
1992	57.721
1993	58.493
1994	61.173
1995	62.282
1996	61.757
1997	61.678
1998	62.216
1999	62.408
2000	62.337
2001	62.09
2002	63.884
2003	63.984
2004	63.102
2005	64.791
2006	65.571
2007	66.682
2008	67.583
2009	68.608
2010	68.921
2011	69.529
2012	70.309
2013	70.832
2014	70.889
2015	70.952
2016	71.682
2017	71.776
2018	71.827
2019	71.871
2020	71.932
2021	71.993
2022	72.067
2023	72.161
2024	72.282
2025	72.434
2026	72.603
2027	72.803
2028	73.04
2029	73.326
2030	73.664