Year	Percent
1950	11.28258
1955	9.44076
1960	8.85159
1965	10.33792
1970	11.29336
1975	11.38753
1980	10.45759
1985	9.93411
1990	10.34182
1995	12.14559
2000	12.5266
2005	12.62685
2010	10.10728
2015	10.38214
2020	10.58437
2025	10.91116
2030	10.53852
2035	9.91106
2040	9.28958
2045	8.93555
2050	8.76454
2055	8.53852
2060	8.14048
2065	7.65255
2070	7.21336
2075	6.88417
2080	6.61857
2085	6.37974
2090	6.1178
2095	5.86799
2100	5.65996