Year	Percent
1950	13.43381
1955	15.82367
1960	15.79452
1965	15.67954
1970	15.91248
1975	14.42828
1980	16.10779
1985	18.59133
1990	17.63302
1995	16.66079
2000	16.19118
2005	15.626
2010	14.72683
2015	13.77367
2020	12.98615
2025	12.42876
2030	11.84976
2035	11.23725
2040	10.61837
2045	10.10804
2050	9.6138
2055	9.14744
2060	8.70305
2065	8.27505
2070	7.8937
2075	7.53792
2080	7.23373
2085	6.94877
2090	6.68673
2095	6.44326
2100	6.2175