2001

6.8

2000

7.1

1988

6.3

2006

5.5

2007

5.3

1998

7.1

1982

6.6

1990

5.8

1991

6.5

2016

8.0

1998

7.1

2002

6.1

2003

6.2

1981

6.2

1982

5.9

1984

6.1

1985

5.3

1994

6.2

1981

6.7

1997

6.0