Year	Percent
1950	15.47988
1955	14.56814
1960	12.85867
1965	13.17676
1970	12.90099
1975	12.14557
1980	11.88125
1985	12.27433
1990	12.46312
1995	12.2923
2000	12.68707
2005	13.24792
2010	13.43186
2015	15.04352
2020	16.51313
2025	17.30476
2030	17.60998
2035	17.76628
2040	18.3952
2045	19.59521
2050	21.23372
2055	22.43885
2060	22.96477
2065	23.15754
2070	23.16828
2075	23.32767
2080	23.70095
2085	24.07083
2090	24.27536
2095	24.31141
2100	24.25513