Year	annual %
1961	3.4935075715066404
1962	4.205395363209448
1963	4.817978158558006
1964	4.73227767082011
1965	3.056643177602453
1966	3.2680449862990884
1967	3.235276778283307
1968	3.2297435254055102
1969	3.2413531653406693
1970	3.210490686446164
1971	3.239173527872623
1972	3.162240168685983
1973	3.3037415127156606
1974	3.4149702146977887
1975	3.2852370336859025
1976	3.0887730602462398
1977	3.0015208036492
1978	3.587716671585838
1979	4.160446275510424
1980	4.093858955620803
1981	4.164365125437001
1982	4.221556257900929
1983	3.88524531249017
1984	3.815115910709949
1985	3.7645913820718135
1986	3.759431600765268
1987	3.743712376986565
1988	3.678951060905362
1989	3.541020956731984
1990	3.4770157411060154
1991	3.508051123859019
1992	3.3654977254908687
1993	3.245176475906746
1994	3.1761485044506514
1995	3.1224054648174757
1996	3.0809407011792587
1997	3.0352476183766584
1998	2.983577289365911
1999	2.9098979094112565
2000	2.86371033838293
2001	2.929999310163666
2002	2.9542367070369124
2003	2.894035901902754
2004	2.8705304861663876
2005	2.8276348156941253
2006	2.696617937238699
2007	2.5787722293199096
2008	2.60241763805233
2009	2.581897697662299
2010	2.518537143045478
2011	2.4232365847011437
2012	2.429101795251796
2013	2.411653335239407
2014	2.357926028313557
2015	2.3101059572498315
2016	2.225515899244286
2017	2.1724554783675245
2018	2.0738247250250623
2019	1.9477483051566225
2020	1.7655254432390706
2021	1.579852223966597
2022	1.2503187972217233
2023	1.337526565975324