Year	Percent
1950	29.04768
1955	27.9581
1960	25.26812
1965	22.84131
1970	22.97876
1975	22.29467
1980	27.28264
1985	29.81517
1990	32.71086
1995	31.7469
2000	31.49824
2005	27.21953
2010	22.11627
2015	20.74029
2020	21.89163
2025	23.73026
2030	25.35311
2035	24.62269
2040	22.62726
2045	21.27856
2050	21.06143
2055	21.34403
2060	21.92691
2065	21.94419
2070	21.21292
2075	20.28856
2080	19.74409
2085	19.69368
2090	19.889
2095	20.00475
2100	19.83265