Year	Percent
1990	1.22
1991	1.17
1992	1.05
1993	1.15
1994	1.04
1995	0.98
1996	0.95
1997	0.76
1998	0.77
1999	0.63
2000	0.64
2001	0.72
2002	0.75
2003	0.62
2004	0.71
2005	0.81
2006	0.72
2007	0.9
2008	0.96
2009	0.91
2010	1.01
2011	1.37
2012	1.65
2013	1.68
2014	1.78
2015	1.96
2016	2.16
2017	2.259
2018	2.358
2019	2.457
2020	2.556
2021	2.655
2022	2.754
2023	2.853
2024	2.952
2025	3.051
2026	3.15
2027	3.249
2028	3.348
2029	3.447
2030	3.546