Try putting nulls or leaving the data out altogether where zero and
negative values are and setting interpolateNulls to true.
You should end up with something looking like this:
var data = google.visualization.arrayToDataTable([
['Year', 'Massachusetts', 'National'],
['2010', 88, 76],
['2011', null, 82],
['2012', 96, 86],
['2013', 100, 91],
['2014', null, 94],
['2015', null, 98],
['2016', 100, 99],
['2017', 124, 100],
['2018', 125, 102]]);
var options = { interpolateNulls: true };
or
var data = google.visualization.arrayToDataTable([
['Year', 'Massachusetts', 'National'],
['2010', 88, 76],
['2011', , 82],
['2012', 96, 86],
['2013', 100, 91],
['2014', , 94],
['2015', , 98],
['2016', 100, 99],
['2017', 124, 100],
['2018', 125, 102]]);
var options = { interpolateNulls: true };
Without setting interpolateNulls to true the graph will draw but you will
have gaps in the line.
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