Year	Percent
1950	12.57107
1955	12.47128
1960	14.08552
1965	13.93649
1970	13.74409
1975	13.4915
1980	13.57885
1985	13.36236
1990	13.05967
1995	11.95302
2000	10.83292
2005	10.19834
2010	9.81188
2015	9.48187
2020	9.33746
2025	8.83208
2030	8.30432
2035	7.82159
2040	7.44099
2045	7.15646
2050	6.90222
2055	6.62977
2060	6.35705
2065	6.10406
2070	5.906
2075	5.75136
2080	5.61685
2085	5.49902
2090	5.38296
2095	5.28014
2100	5.19936