Year	annual %
1961	5.908860749596126
1962	5.896993043811047
1963	5.877475196130173
1964	5.914758781626804
1965	5.718148574029594
1966	4.987876556030606
1967	2.6458447134234166
1968	2.6750601001516214
1969	2.669472156884312
1970	2.65599045187004
1971	2.6699032307431647
1972	2.725802079749016
1973	2.7886775253281257
1974	2.866744899657484
1975	4.114337479421482
1976	5.229177583414155
1977	4.827085440506146
1978	4.9614439238363195
1979	5.047972096136897
1980	5.136850822290652
1981	5.209931176863618
1982	5.2657884481484025
1983	5.290049725933896
1984	5.290481062655796
1985	5.268396663177547
1986	5.17342235382709
1987	4.777130420060711
1988	4.321473019938384
1989	4.177824324690226
1990	4.016594613559472
1991	3.8824507499169716
1992	3.7994467912129446
1993	3.6872556383144204
1994	3.5303736144774653
1995	3.3171486447084613
1996	3.1413544377514695
1997	3.0282985315412336
1998	2.8380949305988685
1999	2.769464534393413
2000	2.7481123046651206
2001	2.6907037793395636
2002	2.640071820734245
2003	2.619353160117175
2004	2.6470662285032995
2005	2.5761615389916677
2006	2.6294119880867726
2007	2.789987447481049
2008	2.8486243884222255
2009	2.892792881939079
2010	2.921480595899897
2011	2.923621640206755
2012	2.9332583437715716
2013	2.9212994166614354
2014	2.901821798299828
2015	2.888877931503774
2016	2.852142556740059
2017	2.783424625310664
2018	2.700947183190818
2019	2.607529823881084
2020	2.4729887519154095
2021	2.371249675400791
2022	2.3140935770003614
2023	2.2151788720839356