Year	Percent
1960-01-01	3.418127253507910000000
1961-01-01	1.691001915339530000000
1962-01-01	4.383982781726720000000
1963-01-01	4.996381886452860000000
1964-01-01	10.275860741748600000000
1965-01-01	4.940588067553010000000
1966-01-01	3.873654018613260000000
1967-01-01	5.377781833728570000000
1968-01-01	9.191667995195190000000
1969-01-01	2.205610935212500000000
1970-01-01	2.740420430512200000000
1971-01-01	6.475765430618440000000
1972-01-01	6.662497835153330000000
1973-01-01	10.754471883136900000000
1974-01-01	16.936399998927400000000
1975-01-01	17.811397234021300000000
1976-01-01	14.342693085225800000000
1977-01-01	11.793346918405300000000
1978-01-01	7.799350745521460000000
1979-01-01	7.466961513107400000000
1980-01-01	11.594619249210800000000
1981-01-01	11.305756650954900000000
1982-01-01	9.584927646774430000000
1983-01-01	8.366292606456400000000
1984-01-01	7.067656383281740000000
1985-01-01	5.195621954294340000000
1986-01-01	2.933579204423340000000
1987-01-01	4.113028862050540000000
1988-01-01	5.085928613948810000000
1989-01-01	6.592909801891270000000
1990-01-01	6.149565311798540000000
1991-01-01	4.310212898434610000000
1992-01-01	2.919323192850180000000
1993-01-01	2.190653195564310000000
1994-01-01	1.088556775894070000000
1995-01-01	0.791239406938448000000
1996-01-01	0.629194238121014000000
1997-01-01	1.192558834258400000000
1998-01-01	1.399473785798400000000
1999-01-01	1.162231556694430000000
2000-01-01	3.042100806677960000000
2001-01-01	2.578440800988940000000
2002-01-01	1.571220127893820000000
2003-01-01	0.877440386254743000000
2004-01-01	0.187120559084453000000
2005-01-01	0.623874450025199000000
2006-01-01	1.566663807043840000000
2007-01-01	2.510665652403390000000
2008-01-01	4.065953553583780000000
2009-01-01	-0.000000917360403259616
2010-01-01	1.184135231546500000000
2011-01-01	3.416807542552110000000
2012-01-01	2.808336225615750000000
2013-01-01	1.478286156888040000000
2014-01-01	1.041196211784390000000
2015-01-01	-0.207928839905218000000
2016-01-01	0.356684500891696000000
2017-01-01	0.754015047084413000000