1986

7.1

1989

5.4

2015

7.6

1971

6.4

2013

5.6

1960

7.5

1994

5.3

1988

7.1

1993

6.7

1982

5.7

1996

6.3

1974

7.9

2001

6.2

2005

5.3

2014

5.5

1984

7.7

1981

6.9

2001

7.4

1996

6.1

2009

5.6