Year	Percent
1990	3.259
1991	3.413
1992	3.449
1993	3.485
1994	3.567
1995	3.539
1996	3.623
1997	3.68
1998	3.736
1999	3.799
2000	3.882
2001	3.93
2002	3.984
2003	4.124
2004	4.207
2005	4.336
2006	4.416
2007	4.489
2008	4.528
2009	4.537
2010	4.598
2011	4.031
2012	4.401
2013	4.175
2014	3.983
2015	3.98
2016	4.005
2017	4.027
2018	4.05
2019	4.073
2020	4.095
2021	4.118
2022	4.141
2023	4.164
2024	4.186
2025	4.209
2026	4.232
2027	4.254
2028	4.277
2029	4.3
2030	4.322