Year	Percent
1950	12.30029
1955	11.4712
1960	11.67754
1965	13.78382
1970	14.90875
1975	15.57034
1980	15.67098
1985	13.36344
1990	13.8071
1995	13.88653
2000	15.15414
2005	16.38126
2010	17.61972
2015	17.62168
2020	17.62102
2025	17.79088
2030	18.61691
2035	19.81243
2040	20.96676
2045	20.47576
2050	20.85409
2055	21.60813
2060	22.2414
2065	23.55026
2070	23.58542
2075	23.33635
2080	23.21488
2085	23.51165
2090	24.13685
2095	24.78722
2100	25.08504