Year	Percent
1950	30.52704
1955	29.59758
1960	29.73723
1965	28.45027
1970	27.28457
1975	27.65021
1980	28.35668
1985	32.00531
1990	35.16518
1995	36.60032
2000	35.19751
2005	31.19306
2010	28.25347
2015	25.20523
2020	24.64135
2025	23.67035
2030	21.49453
2035	20.63311
2040	20.11474
2045	20.10059
2050	20.27614
2055	19.97906
2060	19.73891
2065	19.6569
2070	19.76373
2075	19.94674
2080	20.03442
2085	19.98641
2090	19.84857
2095	19.69683
2100	19.61835