1987

7.3

1988

5.2

1969

3.0

1977

3.3

2004

7.2

2006

7.0

1996

6.6

2002

7.0

1989

4.5

2001

6.7

2001

7.4

1991

5.7

1989

7.0

1995

6.5

2003

6.4

1990

6.8

2002

7.2

1995

6.7

2018

3.2

1971

4.0