Year	Percent
1950	10.40835
1955	10.14862
1960	9.46897
1965	8.91695
1970	10.82403
1975	10.81413
1980	10.93244
1985	10.79147
1990	11.05918
1995	11.63742
2000	12.05711
2005	11.59423
2010	9.99561
2015	7.48419
2020	6.65754
2025	8.16401
2030	9.37045
2035	8.43179
2040	7.40031
2045	6.52349
2050	6.0948
2055	6.10305
2060	6.28339
2065	6.32063
2070	6.04274
2075	5.63349
2080	5.36118
2085	5.28814
2090	5.33105
2095	5.35667
2100	5.28694