2003

7.8

2002

7.8

1975

6.2

1983

6.3

1972

7.0

1991

7.7

1996

7.1

2010

7.9

2013

7.9

2002

8.6

1987

7.1

1994

6.0

1988

7.4

1971

8.1

1997

7.6

2018

6.8

1984

7.5

2018

8.4

1986

7.9

2015

6.7