Year	Percent
1950	4.20658
1955	3.87749
1960	3.866
1965	4.4168
1970	4.85982
1975	5.03539
1980	5.06139
1985	4.79849
1990	4.40252
1995	4.38238
2000	4.29549
2005	4.19382
2010	3.94926
2015	3.90997
2020	3.94148
2025	4.00719
2030	4.20525
2035	4.33397
2040	4.73434
2045	5.23588
2050	5.77322
2055	6.43841
2060	7.30018
2065	8.33309
2070	9.4917
2075	10.75781
2080	12.03124
2085	13.28447
2090	14.50951
2095	15.70395
2100	16.84225