Year	Percent
1950	11.90575
1955	13.72798
1960	15.49977
1965	16.31152
1970	15.8621
1975	15.36187
1980	14.30489
1985	12.40885
1990	11.86911
1995	11.22751
2000	12.57841
2005	12.18432
2010	10.63506
2015	9.38883
2020	9.23584
2025	9.03719
2030	8.61931
2035	8.12175
2040	7.64467
2045	7.23265
2050	6.92229
2055	6.65101
2060	6.39041
2065	6.12717
2070	5.89564
2075	5.69921
2080	5.54618
2085	5.42944
2090	5.32502
2095	5.22093
2100	5.12788