Year	Percent
1950	5.58513
1955	5.14261
1960	4.82574
1965	4.71932
1970	4.84147
1975	4.95822
1980	4.96185
1985	4.81233
1990	4.93593
1995	4.81012
2000	4.7277
2005	4.62259
2010	4.49795
2015	4.71467
2020	5.12212
2025	5.58755
2030	6.06795
2035	6.58685
2040	7.23187
2045	8.10815
2050	9.07102
2055	9.95762
2060	10.79871
2065	11.6779
2070	12.68339
2075	13.82248
2080	14.92936
2085	15.98121
2090	16.98886
2095	17.99337
2100	19.02359