date,value
1950-01-01,0.720642685890198
1951-01-01,0.720642685890198
1952-01-01,0.720642685890198
1953-01-01,0.720642685890198
1954-01-01,0.720642685890198
1955-01-01,0.720642685890198
1956-01-01,0.720642685890198
1957-01-01,0.720642685890198
1958-01-01,0.720642685890198
1959-01-01,0.720642685890198
1960-01-01,0.720642685890198
1961-01-01,0.720642685890198
1962-01-01,0.718753397464752
1963-01-01,0.714493215084076
1964-01-01,0.715605854988098
1965-01-01,0.72273588180542
1966-01-01,0.727008104324341
1967-01-01,0.742672801017761
1968-01-01,0.740289688110352
1969-01-01,0.748302578926086
1970-01-01,0.751107513904572
1971-01-01,0.75379091501236
1972-01-01,0.757878303527832
1973-01-01,0.7451092004776
1974-01-01,0.735606133937836
1975-01-01,0.721967935562134
1976-01-01,0.72607159614563
1977-01-01,0.721867263317108
1978-01-01,0.703604936599731
1979-01-01,0.680134773254395
1980-01-01,0.667913734912872
1981-01-01,0.692736089229584
1982-01-01,0.707360446453095
1983-01-01,0.677225232124329
1984-01-01,0.661423683166504
1985-01-01,0.658374547958374
1986-01-01,0.679513037204742
1987-01-01,0.67333859205246
1988-01-01,0.681399405002594
1989-01-01,0.693052709102631
1990-01-01,0.710365831851959
1991-01-01,0.73360276222229
1992-01-01,0.7385174036026
1993-01-01,0.722486138343811
1994-01-01,0.695457935333252
1995-01-01,0.683057188987732
1996-01-01,0.676772058010101
1997-01-01,0.673506140708923
1998-01-01,0.686226963996887
1999-01-01,0.669298350811005
2000-01-01,0.653895318508148
2001-01-01,0.657381176948547
2002-01-01,0.657402634620667
2003-01-01,0.645753741264343
2004-01-01,0.639334261417389
2005-01-01,0.629435360431671
2006-01-01,0.634261846542358
2007-01-01,0.639494955539703
2008-01-01,0.63119775056839
2009-01-01,0.672544836997986
2010-01-01,0.650951683521271
2011-01-01,0.639589190483093
2012-01-01,0.650561571121216
2013-01-01,0.649688482284546
2014-01-01,0.641806542873383
2015-01-01,0.670259356498718
2016-01-01,0.661177635192871
2017-01-01,0.651702463626862
2018-01-01,0.654160618782044
2019-01-01,0.658807039260864
2020-01-01,0.652546226978302
2021-01-01,0.635081887245178
2022-01-01,0.628219187259674
2023-01-01,0.659301698207855