Minimum wage during years it changed

HTML

<script src="http://code.highcharts.com/highcharts.js"></script>
<script src="http://code.highcharts.com/modules/exporting.js"></script>

<div id="container" style="min-width: 400px; height: 400px; margin: 0 auto"></div>

CSS

series: [{
            name: 'Nominal',
            data: [3.1, 3.35, 3.8, 4.25, 4.75, 5.15, 5.85, 6.55, 7.25, 7.25, 8.5, 10]
        }, {
            name: 'Real Dollars based of 2013',
            data: [8.76, 8.59, 6.77, 7.27, 7.05, 7.47, 6.57, 7.09, 7.87, 7.25]
        }]

8.5, 10

JavaScript

$(function () {
    $('#container').highcharts({
        chart: {
            type: 'column'
        },
        title: {
            text: 'The minimum wage during years it changed'
        },
        subtitle:{
            text: 'Dollars adjusted for inflation are calculated based on the purchasing power of $1 in July of 2013.<br/>Source: Congressional Research Service'
        },
        
        xAxis: {
            categories: [
                '1980',
                '1981',
                '1990',
                '1991',
                '1996',
                '1997',
                '2007',
                '2008',
                '2009',
                
                '2015',
                '2016',
            ]
        },
        yAxis: [{
            min: 0,
            title: {
                text: 'Dollars'
            }
        }, ],
        legend: {
            shadow: false
        },
        tooltip: {
            shared: true
        },
        plotOptions: {
            column: {
                grouping: false,
                shadow: false,
                borderWidth: 0
            }
        },
        series: [{
            name: 'Dollars Adjusted for Inflation',
            color: '#CD894E',
            data: [8.76, 8.59, 6.77, 7.27, 7.05, 7.47, 6.57, 7.09, 7.87],
           
        }, {
            name: 'Dollar amount when passed',
            color: 'rgba(126,86,134,.9)',
            data: [3.1, 3.35, 3.8, 4.25, 4.75, 5.15, 5.85, 6.55, 7.25],
          
        },
          {
            name: 'SB41',
            color: '#BEAAC2',
            data: [null, null, null, null, null, null, null, null, null, 10.10],
          
        },
        {
            name: 'SB160',
            color: 	'#583C5E',
            data: [null, null, null, null, null, null, null, null, null, 8.50, 10],
          
        },
                   
                  
                  ]
    });
});