Year	Percent
1950	18.85
1955	18.13007
1960	18.4779
1965	18.60664
1970	18.66814
1975	18.66696
1980	18.60937
1985	18.27699
1990	17.97233
1995	17.60085
2000	17.17227
2005	17.8606
2010	17.45281
2015	17.08571
2020	16.31249
2025	15.64341
2030	15.08046
2035	14.52098
2040	13.89455
2045	13.24199
2050	12.58559
2055	11.98364
2060	11.43648
2065	10.90187
2070	10.40101
2075	9.90912
2080	9.44301
2085	9.01349
2090	8.6217
2095	8.24478
2100	7.87815