1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994
 487  992  658 1375 1417 1964 1652  951 1416  922 1668 1457 1562 1296 1332 1008  714  615
1995 1996 1997 1998 1999 2000 2001 2002
1180 1689 2492 1590 1108 1509 1540 2192

# With "tally" fuction of tidyverse

# A tibble: 26 x 2
    year     n
   <int> <int>
 1  1977   487
 2  1978   992
 3  1979   658
 4  1980  1375
 5  1981  1417
 6  1982  1964
 7  1983  1652
 8  1984   951
 9  1985  1416
10  1986   922
# ... with 16 more rows