1989

6.0

2001

5.4

1994

6.8

2002

6.7

2002

7.0

2004

6.8

2005

5.9

1995

6.5

2017

7.8

1976

2.5

1997

7.7

1994

6.3

2000

6.3

2000

7.6

2016

6.3

2014

6.3

2017

6.4

2006

6.1

2007

5.7

2007

5.8