Year	Percent
1950	30.67828
1955	28.02337
1960	25.98551
1965	25.20995
1970	26.35881
1975	29.66127
1980	32.44949
1985	34.80033
1990	34.21942
1995	32.22903
2000	29.88985
2005	28.00337
2010	27.20212
2015	27.76359
2020	27.91418
2025	27.58331
2030	26.89925
2035	25.71589
2040	25.16744
2045	24.94313
2050	24.75609
2055	24.79497
2060	24.56384
2065	24.14169
2070	23.73462
2075	23.48142
2080	23.36335
2085	23.29224
2090	23.17408
2095	22.95922
2100	22.71331