Year	Percent
1950	12.90843
1955	11.6934
1960	12.68188
1965	11.54214
1970	9.16981
1975	8.8261
1980	8.51708
1985	8.90047
1990	8.94709
1995	8.22448
2000	7.06831
2005	5.86236
2010	5.55551
2015	5.51323
2020	5.20498
2025	4.77039
2030	4.54326
2035	4.45559
2040	4.43401
2045	4.38542
2050	4.29061
2055	4.20153
2060	4.15584
2065	4.17806
2070	4.23052
2075	4.27227
2080	4.29188
2085	4.29493
2090	4.29474
2095	4.31589
2100	4.34692