Year	Percent
1950	10.14641
1955	9.93099
1960	9.57211
1965	9.32432
1970	10.2597
1975	10.09185
1980	10.05456
1985	10.30712
1990	10.84742
1995	11.22885
2000	11.7711
2005	11.64121
2010	11.233
2015	10.74949
2020	10.69523
2025	11.08418
2030	11.29055
2035	10.82526
2040	10.36338
2045	10.02354
2050	9.81417
2055	9.64789
2060	9.43274
2065	9.16626
2070	8.86245
2075	8.57313
2080	8.32819
2085	8.11375
2090	7.89322
2095	7.66768
2100	7.43672