Year	Percent
1950	12.6563
1955	13.313
1960	13.64094
1965	13.73859
1970	13.85207
1975	14.0701
1980	14.31066
1985	13.93688
1990	13.87971
1995	14.51699
2000	15.16378
2005	16.02133
2010	15.4645
2015	15.38668
2020	15.05547
2025	14.983
2030	14.64392
2035	14.20603
2040	13.70196
2045	13.17282
2050	12.6767
2055	12.20705
2060	11.70738
2065	11.20386
2070	10.70735
2075	10.25602
2080	9.8295
2085	9.42779
2090	9.03739
2095	8.65961
2100	8.28361