Year	Percent
1950	11.56314
1955	11.52118
1960	12.89598
1965	13.86292
1970	15.63125
1975	14.7334
1980	13.00102
1985	11.45224
1990	11.54622
1995	10.90071
2000	10.54714
2005	10.07124
2010	8.55444
2015	7.62808
2020	6.76858
2025	7.42772
2030	6.85276
2035	6.2119
2040	5.6277
2045	5.19015
2050	4.97386
2055	4.87892
2060	4.7764
2065	4.58303
2070	4.31869
2075	4.13082
2080	4.05607
2085	4.07358
2090	4.09324
2095	4.04782
2100	3.93575