Year	Percent
1950	13.05047
1955	13.39322
1960	13.58508
1965	13.82719
1970	14.23248
1975	14.60155
1980	14.9684
1985	15.15792
1990	15.08283
1995	15.05115
2000	13.98585
2005	13.70229
2010	14.05611
2015	14.05484
2020	13.46546
2025	12.78885
2030	12.25082
2035	11.87427
2040	11.50792
2045	11.09831
2050	10.6606
2055	10.21574
2060	9.83083
2065	9.45798
2070	9.12589
2075	8.78381
2080	8.4422
2085	8.12385
2090	7.82893
2095	7.5295
2100	7.26465