Year	Percent
1950	12.81058
1955	11.80814
1960	11.89541
1965	14.05419
1970	15.28507
1975	16.02909
1980	16.09356
1985	13.55366
1990	13.95266
1995	14.15234
2000	15.52691
2005	16.8268
2010	18.28578
2015	18.38661
2020	18.44823
2025	18.71265
2030	19.2929
2035	20.2468
2040	21.17836
2045	20.37746
2050	20.75226
2055	21.51495
2060	22.15587
2065	23.58284
2070	23.60141
2075	23.33579
2080	23.15526
2085	23.34997
2090	23.86981
2095	24.42387
2100	24.64745