Year	Percent
1950	5.37491
1955	4.54596
1960	4.2779
1965	4.24963
1970	4.25346
1975	4.62603
1980	4.61741
1985	4.61169
1990	5.0321
1995	5.41554
2000	6.01792
2005	6.57235
2010	6.85482
2015	7.05648
2020	7.92504
2025	9.68648
2030	11.89395
2035	14.11915
2040	16.92782
2045	20.04878
2050	23.13841
2055	26.02793
2060	28.83528
2065	31.46769
2070	33.59161
2075	35.37836
2080	36.93067
2085	38.19868
2090	39.16825
2095	39.84457
2100	40.29046