Year	Percent
1950	12.15015
1955	11.9417
1960	11.90058
1965	12.11749
1970	12.55696
1975	13.0756
1980	13.44417
1985	13.41762
1990	13.68653
1995	14.46838
2000	15.79431
2005	17.43071
2010	18.84132
2015	19.87941
2020	20.64022
2025	21.47235
2030	22.33233
2035	23.23955
2040	23.8709
2045	24.42898
2050	24.92493
2055	25.26459
2060	25.5816
2065	25.56591
2070	25.33625
2075	24.97415
2080	24.59103
2085	24.20166
2090	23.80753
2095	23.42007
2100	23.06617