Year	Percent
1950	30.40432
1955	28.92063
1960	28.48807
1965	27.07388
1970	25.9249
1975	27.15905
1980	29.03279
1985	30.79007
1990	31.26423
1995	30.55334
2000	29.4498
2005	27.52972
2010	27.79106
2015	28.42295
2020	28.01589
2025	26.80697
2030	25.82335
2035	25.11442
2040	24.65546
2045	24.53123
2050	24.60165
2055	24.56509
2060	24.23219
2065	23.86017
2070	23.55976
2075	23.35654
2080	23.2154
2085	23.0526
2090	22.79012
2095	22.43988
2100	22.06765