1997

7.6

1984

4.5

1991

5.0

2005

6.7

2007

6.1

2013

5.6

2019

5.3

1990

8.0

2009

6.2

2015

5.2

1982

6.5

2002

7.3

2008

6.2

1999

6.8

2006

6.6

1985

7.5

1996

6.1

2003

6.6

1966

7.2

2002

7.8