Year	Percent
1950	10.40875
1955	10.03189
1960	12.0417
1965	12.98861
1970	15.26206
1975	14.7572
1980	14.64831
1985	13.66666
1990	13.33236
1995	14.12561
2000	11.61508
2005	9.17411
2010	8.10676
2015	9.35803
2020	11.13225
2025	9.88643
2030	8.6534
2035	7.76602
2040	7.34611
2045	7.33509
2050	7.48062
2055	7.50896
2060	7.18328
2065	6.67573
2070	6.31365
2075	6.18385
2080	6.19619
2085	6.2085
2090	6.10539
2095	5.89984
2100	5.67589