Year	Percent
1950	10.67143
1955	10.87915
1960	10.2336
1965	13.21396
1970	11.27069
1975	11.95323
1980	13.57436
1985	13.65524
1990	13.80703
1995	13.26644
2000	12.77541
2005	12.44342
2010	12.47872
2015	11.85767
2020	11.87847
2025	11.91932
2030	11.53988
2035	11.14205
2040	10.81289
2045	10.54265
2050	10.29585
2055	10.03911
2060	9.75125
2065	9.45294
2070	9.14773
2075	8.88999
2080	8.61723
2085	8.34988
2090	8.06939
2095	7.79392
2100	7.51905