Year	Percent
1950	15.86389
1955	15.78277
1960	15.69032
1965	15.4465
1970	15.15885
1975	14.74524
1980	14.36838
1985	14.33462
1990	14.46541
1995	15.67195
2000	16.72982
2005	17.54353
2010	18.23966
2015	19.14069
2020	20.08354
2025	21.63906
2030	23.34353
2035	24.5899
2040	25.29392
2045	25.33482
2050	25.27761
2055	25.6611
2060	26.14642
2065	26.55119
2070	26.64961
2075	26.37333
2080	26.08612
2085	25.87734
2090	25.71914
2095	25.54236
2100	25.29413