Year	Percent
1950	10.28966
1955	10.07594
1960	9.35281
1965	9.36485
1970	10.37814
1975	10.37412
1980	10.31616
1985	10.11048
1990	10.05952
1995	10.06863
2000	10.29775
2005	10.07841
2010	9.57525
2015	9.26145
2020	8.91885
2025	8.46975
2030	7.69925
2035	7.44461
2040	7.18645
2045	6.92547
2050	6.60339
2055	6.26928
2060	6.01883
2065	5.84668
2070	5.70691
2075	5.56726
2080	5.43552
2085	5.31943
2090	5.23157
2095	5.17228
2100	5.12939