1973

6.9

2005

8.1

1981

6.1

1982

6.3

2004

8.3

1992

5.8

1999

7.5

2007

6.4

1998

8.2

2005

7.9

2002

7.3

1994

7.6

2006

6.2

1971

7.4

2007

8.1

2002

0.0

2005

5.5

2004

0.0

1990

6.0

2021

0.0