1944

6.2

1986

5.8

1996

8.0

2013

7.9

1970

8.2

1972

6.2

2006

6.9

2008

7.0

2001

7.4

2000

7.4

1978

6.6

2012

7.7

1994

6.5

2007

7.2

1994

6.9

2001

5.9

2015

7.3

2021

6.8

2004

7.8

2013

7.2