<p>A second interesting characteristic of the trends depicted on this chart is that there are numerous sharp ‘spikes’ within the 19th century. This is partly as a outcome of the data high quality is improving over time, but in addition …</p>
<p>A second interesting characteristic of the trends depicted on this chart is that there are numerous sharp ‘spikes’ within the 19th century. This is partly as a outcome of the data high quality is improving over time, but in addition …</p>