1979

7.7

1977

7.7

1994

6.8

1973

7.4

2016

0.0

2005

6.7

2007

6.1

2006

6.3

2003

5.8

1991

6.2

1990

6.7

2003

6.4

2015

7.2

1997

0.0

2005

7.0

2000

7.1

2004

7.3

1997

7.2

2002

6.4

1984

7.2