Year	Percent
1950	12.76859
1955	12.10395
1960	11.36152
1965	12.51067
1970	12.52661
1975	14.08645
1980	13.95698
1985	15.0091
1990	15.02935
1995	14.86085
2000	14.57599
2005	14.88442
2010	14.98497
2015	14.77732
2020	14.51504
2025	13.95285
2030	13.3389
2035	12.72669
2040	12.12553
2045	11.50513
2050	10.84789
2055	10.1989
2060	9.60152
2065	9.075
2070	8.60379
2075	8.18635
2080	7.79339
2085	7.42904
2090	7.10418
2095	6.83267
2100	6.58215