Year	annual %
1961	6.84748655971901
1962	6.9552974055583014
1963	7.951707097956224
1964	8.863769500038302
1965	8.778113370339735
1966	8.694165230475118
1967	8.648221399874656
1968	8.627026166979691
1969	8.581167148121907
1970	8.600539928438598
1971	8.711944177735113
1972	8.900537532191063
1973	9.012290545829513
1974	8.995295536842919
1975	8.244796020234347
1976	7.824115979631746
1977	7.616654775043327
1978	7.489279430348396
1979	7.316534699580095
1980	7.168167802098621
1981	6.9941585341124
1982	6.828968529168732
1983	6.710814230575833
1984	6.569780157507229
1985	6.390409036046823
1986	6.208546505910966
1987	5.327563806665954
1988	5.23778638575171
1989	5.131566520502556
1990	5.012399335616664
1991	4.810286081983675
1992	4.506026950218908
1993	3.647118437886236
1994	3.1882283297696636
1995	3.1055961015573357
1996	3.027671540896469
1997	2.984244589810439
1998	2.9417423752696568
1999	2.882675706661743
2000	2.818210954042699
2001	2.7549835208146334
2002	2.6875494775454345
2003	2.585629356411886
2004	2.4608597012664033
2005	3.3406679862066033
2006	4.23626307545006
2007	4.20344260259126
2008	4.126140744806686
2009	4.009648521773662
2010	3.4712087112967596
2011	2.7468222809236584
2012	2.4642885976919073
2013	2.3880368762218493
2014	2.2875728018545307
2015	2.189460371582618
2016	2.2797923446945383
2017	2.562794482273035
2018	2.649278832008808
2019	2.5478289085464523
2020	0.7364013263781448
2021	0.132008528859113
2022	1.52826624499769
2023	1.727900866733379