Year	Percent
1950	16.29015
1955	15.7387
1960	16.0036
1965	16.39494
1970	16.25862
1975	15.14999
1980	12.46692
1985	16.41919
1990	16.5032
1995	17.93959
2000	20.94442
2005	17.30597
2010	16.8216
2015	16.46461
2020	15.60533
2025	15.13876
2030	14.56102
2035	13.77159
2040	12.9014
2045	12.07213
2050	11.30946
2055	10.65241
2060	10.02656
2065	9.42654
2070	8.8185
2075	8.24249
2080	7.74822
2085	7.30649
2090	6.94056
2095	6.60674
2100	6.29959