Year	Percent
1950	29.90336
1955	28.29732
1960	28.26446
1965	28.18313
1970	30.54707
1975	33.37011
1980	34.42312
1985	34.86471
1990	32.05036
1995	29.21866
2000	27.5477
2005	26.33708
2010	25.73596
2015	26.32973
2020	25.70621
2025	24.74705
2030	24.37608
2035	23.78363
2040	23.93941
2045	24.22353
2050	24.07486
2055	23.84551
2060	23.49612
2065	23.19257
2070	23.02102
2075	22.93126
2080	22.81142
2085	22.59594
2090	22.32852
2095	22.07327
2100	21.86231