Year	Percent
1950	10.17793
1955	10.40789
1960	10.51365
1965	10.23105
1970	10.00868
1975	10.08351
1980	9.41987
1985	8.74203
1990	8.29629
1995	9.19964
2000	10.91764
2005	11.43892
2010	8.84795
2015	5.60802
2020	4.55762
2025	5.77711
2030	6.73633
2035	6.59077
2040	5.99628
2045	5.25288
2050	4.78499
2055	4.68779
2060	4.78988
2065	4.83133
2070	4.70204
2075	4.47922
2080	4.31335
2085	4.29845
2090	4.40116
2095	4.51567
2100	4.54835