Year	Percent
1950	16.28462
1955	17.5261
1960	17.16008
1965	16.88537
1970	16.71044
1975	16.63704
1980	16.67129
1985	16.20033
1990	15.42315
1995	14.75113
2000	14.1113
2005	13.17481
2010	12.19419
2015	11.25978
2020	10.73358
2025	10.17566
2030	9.60465
2035	9.02221
2040	8.48387
2045	7.99836
2050	7.57528
2055	7.19283
2060	6.84957
2065	6.53548
2070	6.25745
2075	6.00965
2080	5.80036
2085	5.61644
2090	5.45286
2095	5.31108
2100	5.18448