Year	annual %
1961	2.767867767595817
1962	3.678208851136972
1963	4.4387246157095746
1964	4.350848985764216
1965	2.3529093329731126
1966	2.574925127672728
1967	2.6369332413378714
1968	2.7750913188045985
1969	2.9004010144679597
1970	2.9178927206429393
1971	3.1369924032059515
1972	2.7939575588047347
1973	2.987276975983775
1974	3.137183435976425
1975	2.3864813806251988
1976	2.438532078661453
1977	2.2965724301971875
1978	3.0713769153215793
1979	3.8839713716641597
1980	3.870345971567076
1981	3.950807667789988
1982	4.012305632633598
1983	3.611677433754167
1984	3.520718629436729
1985	3.4994056913425027
1986	3.55939365125289
1987	3.62923629739538
1988	3.6023994538440434
1989	3.546866073598423
1990	3.4865831704114782
1991	3.520122999695772
1992	3.39882647898591
1993	3.3385129772630364
1994	3.3185957667224812
1995	3.265803583673275
1996	3.2364139963015077
1997	3.1543436107900362
1998	3.096199781521932
1999	2.9863829252634986
2000	2.949940409003162
2001	3.3126732146115216
2002	3.4184288929047852
2003	3.3090521711877585
2004	3.2190332036492464
2005	3.137695447675526
2006	3.011244968876923
2007	2.917907895050803
2008	2.8717728844279407
2009	2.7788714553632587
2010	2.7122712939094242
2011	2.51403269323977
2012	2.502097659541775
2013	2.4435430325334266
2014	2.38762729049877
2015	2.321231209631563
2016	2.2832814870819647
2017	2.2475735424267214
2018	2.0947721778422164
2019	1.9562692367406669
2020	1.7825938437064224
2021	1.5453043132067847
2022	1.453661487720865
2023	1.4369962359776167