Year	Percent
1990	3.752
1991	3.694
1992	3.925
1993	4.063
1994	4.246
1995	4.415
1996	4.571
1997	4.704
1998	4.846
1999	5.146
2000	5.542
2001	5.876
2002	6.24
2003	6.668
2004	7.094
2005	7.523
2006	7.938
2007	8.315
2008	8.634
2009	8.956
2010	9.241
2011	9.395
2012	9.598
2013	9.827
2014	10.036
2015	10.22
2016	10.371
2017	10.537
2018	10.704
2019	10.87
2020	11.037
2021	11.203
2022	11.369
2023	11.536
2024	11.702
2025	11.869
2026	12.035
2027	12.201
2028	12.368
2029	12.534
2030	12.7