Year	Percent
1990	1.477
1991	1.488
1992	1.461
1993	1.477
1994	1.524
1995	1.527
1996	1.505
1997	1.41
1998	1.376
1999	1.401
2000	1.328
2001	1.299
2002	1.401
2003	1.56
2004	1.639
2005	1.688
2006	1.698
2007	1.711
2008	1.635
2009	1.638
2010	1.72
2011	2.06
2012	2.147
2013	2.368
2014	2.597
2015	2.636
2016	2.734
2017	2.825
2018	2.916
2019	3.006
2020	3.097
2021	3.188
2022	3.279
2023	3.37
2024	3.46
2025	3.551
2026	3.642
2027	3.733
2028	3.823
2029	3.914
2030	4.005