1967

6.1

1996

5.8

1988

6.3

2006

7.4

2014

6.5

2003

7.3

2003

6.8

2005

5.2

2003

5.7

2001

6.8

1984

7.2

1988

6.1

1969

6.6

2017

6.2

2015

6.5

1986

6.2

1975

6.4

2022

7.1

1995

5.6