1970

-72

1973

-76

1977

-80

1981

-84

1985

-88

1989

-92

1993

-96

1997

-2000

2001

-04

2005

-08

2009

-12

βt ≥ 1

35

48

48

48

48

21

0

40

48

44

48

significant at 5%

0

0

0

0

0

0

0

0

0

0

0

βt < 1

0

0

0

0

0

27

48

8

0

4

0

significant at 5%

0

0

0

0

0

0

0

0

0

0

0

βt ≥ 1

35

48

48

48

48

48

48

48

48

48

48

significant at 5%

9

48

47

40

48

48

48

48

48

48

48

βt < 1

0

0

0

0

0

0

0

0

0

0

0

significant at 5%

0

0

0

0

0

0

0

0

0

0

0