1970

7.2

2009

6.7

2017

4.9

1934

6.7

2001

6.9

1996

6.7

1995

7.3

2003

6.6

2018

7.6

1964

5.8

2007

6.9

2002

6.1

2006

5.1

1977

7.4

2001

6.8

1988

5.8

1995

7.3

1972

6.2

2000

7.1

1992

6.9