2003

6.8

2005

7.3

1972

5.0

1992

5.2

2001

7.6

2003

5.8

2006

5.7

2001

6.9

2002

6.3

2004

7.2

1998

6.8

2007

6.4

2007

6.7

2002

5.3

2005

6.3

1979

4.8

2001

6.3

2004

6.6

1981

6.2

2018

5.8