# A tibble: 7,508 x 4
   SURVEY  YEAR SITE  canopy_area
    <dbl> <dbl> <chr>       <dbl>
 1      1  2009 SOUTH       30.5 
 2      2  2010 SOUTH       69.7 
 3      3  2011 SOUTH       79.6 
 4      4  2012 SOUTH       39.0 
 5      5  2013 SOUTH       40.8 
 6      1  2009 SOUTH        6.16
 7      2  2010 SOUTH        7.29
 8      3  2011 SOUTH       12.5 
 9      4  2012 SOUTH       NA   
10      5  2013 SOUTH        9.62
# … with 7,498 more rows