Year	Percent
1950	4.21051
1955	4.59873
1960	4.521
1965	4.32593
1970	4.56517
1975	4.65206
1980	4.85956
1985	5.3089
1990	6.12218
1995	7.18811
2000	8.92434
2005	10.71538
2010	13.2729
2015	16.23573
2020	20.74264
2025	25.09909
2030	29.23775
2035	32.87088
2040	35.32474
2045	37.58998
2050	38.69301
2055	40.37702
2060	41.17373
2065	40.70623
2070	39.86221
2075	39.15212
2080	38.75841
2085	38.60307
2090	38.73408
2095	38.87829
2100	38.84356