Year	Percent
1950	13.46902
1955	13.60661
1960	15.28539
1965	15.20261
1970	15.47877
1975	15.27994
1980	13.82251
1985	13.61112
1990	15.12441
1995	13.20996
2000	11.92327
2005	10.50761
2010	8.99537
2015	9.43179
2020	9.17123
2025	8.58421
2030	7.92071
2035	7.30236
2040	6.61602
2045	6.19353
2050	6.04146
2055	5.93504
2060	5.82112
2065	5.65583
2070	5.48712
2075	5.37421
2080	5.32258
2085	5.31946
2090	5.30485
2095	5.2566
2100	5.1889