Year	Percent
1950	8.31064
1955	8.40148
1960	8.67012
1965	8.30862
1970	9.0186
1975	9.10066
1980	8.70313
1985	8.59109
1990	8.1502
1995	6.4683
2000	5.31445
2005	4.79635
2010	4.43786
2015	4.93556
2020	5.29824
2025	4.7143
2030	4.33985
2035	4.03247
2040	3.92905
2045	4.03412
2050	4.24313
2055	4.4025
2060	4.40658
2065	4.33648
2070	4.30916
2075	4.35888
2080	4.4594
2085	4.55213
2090	4.57986
2095	4.54113
2100	4.47481