Year	Percent
1950	29.18878
1955	26.96209
1960	25.25187
1965	24.59934
1970	25.35271
1975	27.59737
1980	29.313
1985	31.4404
1990	31.42814
1995	31.35281
2000	29.34557
2005	27.97633
2010	26.88751
2015	26.10952
2020	26.15621
2025	25.56284
2030	25.01303
2035	24.2375
2040	23.87798
2045	23.87114
2050	23.54102
2055	23.21556
2060	22.85076
2065	22.47681
2070	22.13679
2075	21.86236
2080	21.61432
2085	21.36113
2090	21.10368
2095	20.84732
2100	20.61194