Year	Percent
1950	11.63025
1955	13.57337
1960	15.24147
1965	15.63235
1970	15.88372
1975	16.00328
1980	16.35056
1985	16.42271
1990	16.38618
1995	15.75984
2000	14.34889
2005	14.60614
2010	14.37281
2015	14.0392
2020	12.92852
2025	12.24154
2030	11.6512
2035	11.14561
2040	10.62996
2045	10.07461
2050	9.52501
2055	9.04158
2060	8.59614
2065	8.18467
2070	7.79885
2075	7.43041
2080	7.06876
2085	6.74755
2090	6.47767
2095	6.23551
2100	6.02398