1991

7.1

1994

3.0

2006

4.3

1974

6.0

1997

7.5

1998

5.5

1990

8.5

1987

4.3

1992

6.1

1988

4.5

1990

7.4

1989

6.8

1980

7.9

2015

9.0

2008

4.8

1972

8.7

1984

6.3

1999

8.7

1973

6.2

1974

6.0

1993

5.2

1985

6.8