Count number of posts in a list of labels

• Before1810: 34 posts
• 1810s: 72 posts
• 1820s: 45 posts
• 1830s: 34 posts
• 1840s: 77 posts
• 1850s: 56 posts
• 1860s: 77 posts
• 1870s: 69 posts
• 1880s: 75 posts
• 1890s: 16 posts
• 1900s: 52 posts
• 1910s: 17 posts
• 1913: 153 posts
• 1914: 102 posts
• 1915: 218 posts
• 1916: 143 posts
• 1917: 184 posts
• 1918: 220 posts
• 1919: 88 posts
• 1920: 85 posts
• 1921: 70 posts
• 1922: 37 posts
• 1923: 40 posts
• 1924: 52 posts
• 1925: 13 posts