Year	Percent
1950	15.51471
1955	12.09584
1960	12.29206
1965	14.70183
1970	15.61902
1975	15.66607
1980	15.2552
1985	14.62975
1990	16.44696
1995	16.35147
2000	13.7944
2005	10.4328
2010	8.55264
2015	8.63702
2020	9.26715
2025	8.58088
2030	7.26999
2035	6.02962
2040	5.39806
2045	5.38076
2050	5.53188
2055	5.43765
2060	5.05665
2065	4.64816
2070	4.43843
2075	4.48265
2080	4.62879
2085	4.70226
2090	4.62539
2095	4.4756
2100	4.37803