Year	Percent
1950	16.31761
1955	15.70825
1960	15.9573
1965	16.36369
1970	16.24435
1975	15.14153
1980	12.30876
1985	16.42819
1990	16.49653
1995	17.99373
2000	21.08309
2005	17.39343
2010	16.90624
2015	16.53459
2020	15.69602
2025	15.24268
2030	14.67422
2035	13.88149
2040	13.00992
2045	12.1801
2050	11.41713
2055	10.75987
2060	10.13441
2065	9.5335
2070	8.92641
2075	8.35157
2080	7.85816
2085	7.41579
2090	7.04753
2095	6.70901
2100	6.396