1967

6.8

1985

6.7

1972

7.2

1995

7.3

2012

7.1

1998

7.5

1984

7.2

1998

6.8

1986

5.6

1986

6.3

2010

6.7

2015

6.1

1929

7.4

1967

5.3

1959

8.1

2004

5.7

2000

6.4

2001

7.5

1994

7.4

1989

7.3