1994

7.0

1999

7.1

2007

7.3

2001

6.5

1999

7.4

1988

7.0

2004

7.3

2013

5.7

1968

7.1

2010

4.3

1937

4.6

1955

7.8

1939

6.4

2001

7.0

1949

6.9

2006

6.1

2007

6.9

2003

6.3

2000

5.8

2019

4.3