Year	annual %
1961	3.3532876703364205
1962	3.5061729449111283
1963	3.466330088468794
1964	3.3929256366973304
1965	3.3336828787776702
1966	3.2234066568573327
1967	3.108278555113796
1968	3.016265022971491
1969	2.900334354748063
1970	2.5592318790773514
1971	2.197666173895592
1972	2.1373683459882633
1973	2.1369044694608754
1974	2.134087951870847
1975	2.135136489869285
1976	2.1366692225677126
1977	2.1200996080770045
1978	2.0159880211686088
1979	2.199980765236023
1980	2.4848270275339543
1981	2.427316332519846
1982	2.439400207374597
1983	2.482650417201716
1984	2.5616383384624184
1985	2.6500558597261583
1986	2.7334849382865594
1987	2.7702376605375707
1988	2.724103756739881
1989	2.175259944810219
1990	1.209846535178492
1991	1.3256372459580439
1992	1.5295842616493442
1993	1.450953066104575
1994	1.129515580002049
1995	0.9644993885269841
1996	1.0613560789922227
1997	1.0266013815438024
1998	0.7397672557653997
1999	0.1987165511107477
2000	0.49304504379386854
2001	0.37100835298592016
2002	0.31701034725565763
2003	0.2466473598898128
2004	0.2282533884182425
2005	0.229189071863814
2006	0.2752861903988794
2007	0.4695314302991403
2008	0.6421881342558353
2009	0.7168626535387813
2010	1.8408143127452603
2011	2.2876718702174466
2012	1.6766000544719586
2013	1.765987017578247
2014	1.8905666975770365
2015	1.9475058788108173
2016	1.9416929368546392
2017	1.8859351904894663
2018	1.882481192969903
2019	1.9672961352570728
2020	1.9564200990471867
2021	1.9535198523895874
2022	1.9989401622285332
2023	1.9878821897539354