Year	Percent
1950	9.17083
1955	9.86578
1960	7.49929
1965	6.95259
1970	9.50961
1975	9.72949
1980	9.00755
1985	7.65318
1990	7.4309
1995	7.96796
2000	9.03125
2005	9.46339
2010	7.70649
2015	5.63721
2020	4.58637
2025	5.00908
2030	5.21345
2035	4.7973
2040	4.36962
2045	4.09575
2050	3.94679
2055	4.02383
2060	4.20166
2065	4.29983
2070	4.27881
2075	4.24134
2080	4.28042
2085	4.41558
2090	4.58633
2095	4.70319
2100	4.71798