Year	Percent
1950	8.90933
1955	9.43379
1960	9.76497
1965	9.98067
1970	10.52204
1975	11.76175
1980	12.39989
1985	12.90761
1990	13.41498
1995	13.59911
2000	13.35256
2005	12.82351
2010	12.14455
2015	12.01322
2020	12.47494
2025	11.84224
2030	10.86925
2035	10.15002
2040	9.65684
2045	9.30791
2050	8.97877
2055	8.60678
2060	8.17534
2065	7.74077
2070	7.36861
2075	7.06975
2080	6.81913
2085	6.57082
2090	6.32978
2095	6.10106
2100	5.90029