Year	Percent
1950	12.67492
1955	13.45108
1960	13.66911
1965	13.80207
1970	13.94445
1975	14.19053
1980	14.0129
1985	13.76501
1990	13.81173
1995	14.49181
2000	15.14941
2005	16.05741
2010	15.55643
2015	15.52818
2020	15.21027
2025	15.12419
2030	14.78014
2035	14.33953
2040	13.83492
2045	13.30457
2050	12.80774
2055	12.33887
2060	11.84619
2065	11.34933
2070	10.86013
2075	10.41672
2080	9.99993
2085	9.60644
2090	9.22547
2095	8.85765
2100	8.48838