A rather wonderful animated gif by Hugh Osborn showing the history of planet and exoplanet detections over 265 years. Hat tip to @astrokatie for linking to it on twitter.
One thing that clearly drops out of the early years of this gif (and by early I mean pre-1990) is the difference between Pluto and all the other planets. Just one more reason why Pluto is much better classified as a minor planet.
Apologies to USians out there who want to keep Pluto as it’s the only planet in the Solar System discovered by a USian. The great achievements since then on exoplanets, including Kepler which over the last few years has found hundreds of exoplanets, really does make up for the loss of Pluto.
ETA: Colours relate to different detection methods: dark blue = Solar System; light blue = radial velocity; maroon = direct imaging; orange = microlensing; green = transit (the method used by Kepler, for example).