Year	annual %
1961	2.2302203433543784
1962	2.2878505426729463
1963	2.3308578022060518
1964	2.3727513037739953
1965	2.4148806556445557
1966	2.321099763800961
1967	2.3385192942017246
1968	2.578344475661514
1969	2.591797316972925
1970	2.604841566943623
1971	2.5731568435559895
1972	2.4957322637853045
1973	2.459667811668839
1974	2.359938847926464
1975	2.198122013556608
1976	2.275246134381448
1977	1.689823222902398
1978	1.4491855807840994
1979	1.2323871232427435
1980	0.3170028831707852
1981	2.2450418766725586
1982	3.5921064378712018
1983	2.476381313125818
1984	2.260885077534471
1985	2.475993584007021
1986	2.6057229974598406
1987	3.052782663130946
1988	3.533723079281393
1989	3.4442598336493573
1990	3.301109942116435
1991	3.92939085464375
1992	3.7833279754576963
1993	3.072503461264358
1994	3.0456946739198103
1995	3.0511918532134503
1996	2.995633758724716
1997	2.918624243033791
1998	2.847002843224409
1999	2.813008374154129
2000	2.739716466765849
2001	2.70170069243971
2002	2.708203883518771
2003	2.6794558751465694
2004	2.643080483598851
2005	2.6073891434695478
2006	2.590389275725253
2007	2.5931874914982256
2008	2.367828612067782
2009	2.3233258190245025
2010	2.3275284953700193
2011	2.34588778789099
2012	2.309694989614476
2013	2.2412430592587924
2014	2.1845770993319618
2015	2.163128255011183
2016	2.1709577574032597
2017	2.165718798097007
2018	2.103247076843369
2019	2.0712425975180517
2020	2.0564362527565865
2021	1.9907300933093632
2022	1.9143676213567669
2023	1.8753821014143153