Year	Percent
1950	18.71425
1955	17.73789
1960	17.65718
1965	18.20041
1970	18.35332
1975	18.77084
1980	19.19058
1985	19.09486
1990	19.15417
1995	18.72374
2000	18.92399
2005	17.83478
2010	16.13083
2015	15.16128
2020	14.17987
2025	13.21188
2030	12.20153
2035	11.26654
2040	10.40409
2045	9.66376
2050	8.99476
2055	8.3868
2060	7.83736
2065	7.35836
2070	6.93851
2075	6.58923
2080	6.28903
2085	6.03969
2090	5.81757
2095	5.63121
2100	5.4671