1962

7.9

1995

7.6

1997

6.6

1999

6.3

2002

6.0

2007

6.9

1993

5.5

1989

7.8

1986

7.2

1990

7.5

1996

7.3

1984

7.7

1991

8.1

2003

6.2

2016

1.5

1989

6.9

1991

6.3

2007

6.1

1971

6.4

1989

5.3