Year	Percent
1950	13.17071
1955	13.1349
1960	13.0784
1965	13.37978
1970	13.6206
1975	13.67237
1980	14.0928
1985	14.56831
1990	14.59819
1995	14.22304
2000	13.9446
2005	14.05916
2010	14.39622
2015	14.4539
2020	14.35907
2025	13.88911
2030	13.44027
2035	13.04679
2040	12.64761
2045	12.20855
2050	11.71515
2055	11.19711
2060	10.69079
2065	10.18815
2070	9.74424
2075	9.33464
2080	8.92643
2085	8.53053
2090	8.15606
2095	7.82284
2100	7.50216