Year	Percent
1950	16.0535
1955	17.30093
1960	17.007
1965	16.91278
1970	17.06904
1975	17.32781
1980	17.71698
1985	17.5975
1990	17.90238
1995	17.60568
2000	15.26186
2005	13.4222
2010	12.78631
2015	11.85893
2020	10.88807
2025	9.88636
2030	8.99371
2035	8.24414
2040	7.61245
2045	7.07024
2050	6.6027
2055	6.20675
2060	5.88111
2065	5.63488
2070	5.44554
2075	5.28815
2080	5.15834
2085	5.05228
2090	4.96454
2095	4.89515
2100	4.84533