1975

5.6

1988

7.1

2001

5.1

2002

6.4

1969

3.5

2009

7.5

2004

5.4

2004

1.6

2004

3.7

1988

3.6

1999

5.5

1969

6.5

1977

5.7

2006

7.4

1976

5.6

2013

6.7

2015

3.0

1998

4.0

1993

7.7

2002

5.5