Year	Percent
1990	2.539
1991	2.562
1992	2.47
1993	2.543
1994	2.587
1995	2.4
1996	2.436
1997	2.472
1998	2.508
1999	2.546
2000	2.583
2001	2.622
2002	2.661
2003	2.7
2004	2.415
2005	2.212
2006	2.189
2007	2.239
2008	2.442
2009	3.169
2010	3.722
2011	3.543
2012	3.533
2013	3.837
2014	4.157
2015	4.335
2016	4.361
2017	4.475
2018	4.589
2019	4.703
2020	4.817
2021	4.931
2022	5.045
2023	5.159
2024	5.273
2025	5.387
2026	5.501
2027	5.615
2028	5.729
2029	5.843
2030	5.957