1996

6.7

1979

7.5

1969

6.9

2013

6.6

2015

5.6

2017

7.6

1995

5.4

1995

6.9

1996

5.9

1997

6.0

1999

5.5

2006

5.6

2006

6.1

1995

6.3

1985

6.5

2004

5.7

2006

6.1

1999

5.8

1986

6.8

1994

6.2