Year	Percent
1990	52.144
1991	52.138
1992	52.226
1993	52.399
1994	52.601
1995	52.811
1996	52.902
1997	53.012
1998	53.149
1999	53.264
2000	53.438
2001	53.38
2002	53.339
2003	53.403
2004	53.751
2005	55.057
2006	56.347
2007	57.626
2008	58.893
2009	60.147
2010	61.387
2011	62.609
2012	63.816
2013	65.006
2014	65.144
2015	65.298
2016	65.315
2017	65.673
2018	66.031
2019	66.385
2020	66.734
2021	67.07
2022	67.403
2023	67.729
2024	68.045
2025	68.352
2026	68.643
2027	68.928
2028	69.208
2029	69.487
2030	69.767