Year	Percent
1950	9.90335
1955	9.69869
1960	9.41692
1965	8.75952
1970	9.38982
1975	9.34321
1980	10.0483
1985	11.4527
1990	12.24882
1995	12.26184
2000	11.73861
2005	11.17934
2010	9.66373
2015	8.49924
2020	8.18079
2025	8.28238
2030	8.31936
2035	7.51615
2040	6.78427
2045	6.17692
2050	5.84203
2055	5.76897
2060	5.79412
2065	5.73273
2070	5.54539
2075	5.32186
2080	5.17859
2085	5.14288
2090	5.17431
2095	5.19829
2100	5.16905